Yes, that's NASCAR Sprint Cup Series driver Denny Hamlin holding a No. 11 Philadelphia 76ers jersey, given to him by coach Doug Collins. OK, so he's not replacing the "real" No. 11 Jrue Holiday on the NBA team.
Instead, Hamlin was in Philly at the Wells Fargo Center doing what NASCAR guys do best (well, besides wrecking and dropping sponsor names into every conversation), promoting the upcoming NASCAR race weekend at Dover International Speedway.